Housing for portable motor driven tools



y 1950 a. G. BLUEMINK ETA}. 2,513,271

HOUSING FOR PORTABLE MOTOR DRIVEN TOOLS Filed June 30, 1948 INVENTORS,

2am 1 MW Patented July 4, 1950 UNITED HOUSING FOR PORTABLE MOTOR DRIVEN TOOLS Gary G. Bluemink and Royal-4A. Beach, Racine,

Wis., assignors, byimesneassignments, to Cummins Business Machines Corporation,

Chi-

cago, 111., a corporation of Illinois Application June 30, 1948, SerialNo. 36,195

1 12 Claims. This invention relates to improvements in housings for portable motor driven tools.

Portable motor driven too1s, such as sanders, drills, grinders, etc. are frequently. provided with two handles, one for each hand, particularly where the operation of the tool requiresthe work contacting portion to be manually heldor pressed against the work. On large, heavymotor driven tools it is often necessary to dispose the .handles radially opposite from each otherin order-to secure symmetrical weight distribution. However, with smaller tools, it isfrequently more convenient to have the handles disposed radially atan angle of say 90 or 120 degrees. Where one of the handles is-designed specifically for carrying the weight of the tool and for controlling the operation thereof, as by a switch, and the other one of the handles is designed primarily to permit the operators other hand to-serveprimarily as a guide or to steady the tool, thisasymmetrical arrangement necessitates two models of :each size of tool to be constructed, one model for right handed people, and one'for left handed people.

Furthermore, in doing different kindsof work, it would be advantageous to have a tool in which the angular position of the handlesis adjustable. Thus, where heavier pressure is desired, the handles could be adjusted to the 180 degreeposition, where symmetry of pressure distribution ismore important. For lighter Work, the 90 degree position would be more convenient. Furthermore, this adjustable feature would facilitate the operation of the tool where space is limited.

It is an object of my invention to provide a housing for a portable motor driven tool which housing has two handles, the angular position of which is adjustable.

Itis a further object of ourinvention to provide a motor housing which is comparatively simple in design and capable of being economically manufactured, and which includes a handle, the angular position of which'may be ad justed.

It is a still further object of our invention to provide an improved motor housing construction which provides both means for mounting an adjustable handle, and also provides an air vent for the motor. In this connection, tools of this type are generally provided with cooling means, such as a blower disposed within the motor housing, together with intake and outlet vents bymeans of which a stream of air may be drawn across the motor windings by the blower. One of the difficulties in designing a housing for such a tool resides in the fact that for safety reasons, the vents by thereference numeral ID. 'ofthe tool comprises a two-part housing, one

slot 22.

into-the undercut portions 19 and 2|.

handle.

Other objects, features and advantages will become apparent as the description proceeds.

With reference now to the drawings, in which like referencenumerals denote like parts,

Fig. lis an elevation of a portable motor driven ltoolembodying this invention;

Fig. .2is an end view of the tool shown in Fig. 1, the broken lines indicating a changed position of one of the handles;

Fig. 3 is-an enlarged elevation of portion of the tool, a part of the housing being broken away toshow certain parts in section, the sec- .tion being taken along line 33 of Fig. 4;

Fig. A is an end view of certain of the parts shown in Fig. 3, the housing cap being removed;

Fig. '5 is a detailed perspective view of a modifledform of shoe; and

:Fig. dis a similar view of a modified form of knobwhichcooperates with the shoe of Fig. 5 to provide an adjustable auxiliary handle.

Inthe figures the tool is designated generally The main portion part being referred to as shell II, and the other part being referred to as cap !2. A main handle !3 is suitably secured to the shell 1!, and in eludes a trigger switch M for controlling the operation of a motor 15 which is dispose within the shell, as shown diagrammatically in Figs. 3 aud t. The motor includes an armature shaft [5 which is suitably journaled in the rear portion of shell [I and in the front portion of cap I2, the armature shaft extending through the cap and carrying a sanding disk ll.

The-shell l l is provided with an annular flange l8 which projects forwardly, and provides an undercut'portion l9. An annular flange 20 on cap l2 projects rearwardly and provides a similarundercut-por-tion 2|. The edges of flanges iii and 20 are spaced from each other and form a -A shoe 23 is disposed beneath the flanges, the side portions of the shoe extending The shoe is curved as shown in Fig. 4 to correspond with the base of the knob and the shoe 25, thus fixing i the angular position of the knob 25 with respect; The angular position of they to the handle [3. knob can readily be changed merely by loosening the knob and shifting the whole assembly'com prising the knob, the shoe and the screw threaded member to the desired position.

The two housing portions are held together by means of screws 21, the heads 28 of which. .Q bear against the cap i2, and the threaded ends axial plane as the notches '32." The blower com- H prises a series of radially disposed blades 34 which extend outwardly from a hub the hub being suitably secured to the armature shaft. Inlet vents 36 are provided at the rear of shell i l, Rotation of the blower with the armatureshaft causes air to be expelled through the notches 32 and causes air to be drawn in through the inlet vents 36. Thus the stream of cool air is caused to pass across the motor windings. The notches 32 which form the outlet vents are guarded by v the annular flange 20 on cap I2. The depth and the radial extent of the notches may be varied in accordance with the volume of air desired for cooling purposes, but there will be no exposed opening into the interior of the motor other than that provided by the slot 22, the width of which is comparatively small. We have found it preferable, however, to provide notches of a depth which approximatesthe overhang of the flange Zil. Thus, as shown in Fig. l, the outlet vents provided by the notches are almost completely guarded by the outlet flange. This reduces the likelihood of damaging the blades of the blower by the inadvertent insertion of a tool through the notches. The width of the slot 22 is sufiiciently small that it precludes the possibility of insertion of the operators fingers.

he present invention hasbeen shown in connection with a portable sander, but it is obvious that it can be applied to other types of portable tools. As shown in Fig. 2 in solid lines, the knob is oppositely disposed from the main handle l3. In broken lines there is shown a changed position of the knob, which position would be suitable for a left handed person. Furthermore,

ed into the shoe 23', instead of vice versa, as

shown in Figs. 3 and 4. The rear end of the housing is provided with a tapped bore 37, as shown in Fig. 2, which is adapted to receive the threaded member 2 t. Thus, in a situation where the application of extremely heavy pressure is desired, the knob 25 may be mounted at the rear end of the motorhousing in axial alignment with the sanding disk, as shown in dotted lines in Fig. 1.

; Alt hough wehave shown only a preferred embodiment of our invention, it will be apparent that various modifications and changes can be -m'ade therein without departing from the spirit "foflour invention as defined in the appended claims; I Wedai m'i 1. In aportablemotor driven tool, a substantially cylindrical housing, a pair of cylindrical flanges carried exteriorly of said housing and facing each other to define an annular slot having-undercut portions," a main handlefor said housing, and an auxiliary handle for said housing, said auxiliary-handIe having-means extending into said slot, said means being slidably confined in said slot by said annular flanges, whereby the angular position of said auxiliary handle maybe shifted.

Y 2. A portable tool as defined in claim 1, in which said housing is a two part housing, one of said flanges being mounted on one housing part and the other of said flanges being mounted on the other housing part, and means to secure said housing parts to each other.

' ,3. A portable tool as defined in claim 1, in which the bottom of said slot is closed by a web portion, a blower within said housing substantially opposite said web portion, said web portion being perforated to provide an outlet for the air stream of said blower. V

4. A housing for a portable tool comprising a shell member and a cap member, each being provided with abutting portions, and each being provided with exterior annular flanges which extend toward each other, the edges of said flanges being spaced from each other to form a slot, and each flange providing an undercut portion, a shoe slidably mounted in said undercut portions and confined therein by said flanges, a threaded member secured in said shoe and extending outwardly through said slot, and a knob threaded on to said threaded member and adapted to be tightened up into engagement with said flanges to flx the peripheral position of said knob with respect to said housing.

5. A housing for a portable tool having a shaft disposed interiorly of said housing and air propelling means mounted on said shaft, said housing comprising a shell member and a cap member, each being provided with exterior annular flanges which extend toward each other and located in substantially the same plane as said air propelling means, the edges of said flanges being spaced from each other to form a slot, and each'flange providing an undercut portion communicating with said slot, a shoe slidably mounted insaid-undercut portions and confined therein by said flanges, a threaded member secured in said shoe and extending outwardly through said slot, a knob threaded on to said threaded member and adapted to be tightened up into engagement with said flanges to fix the peripheral position of said knob with respect to said housing, said shell member and said cap member each being provided with abutting portions, at least one of said abutting portions constituting a web portion having an opening to provide an outlet vent adjacent said air propelling means.

6. A housing as defined in claim 5 in which one of said flanges overhangs at least the major portion of the opening provided in said Web portion.

7. In a portable motor driven tool, the combination of a substantially cylindrical housing and air propelling means disposed within said housing, said housing being provided with inlet and outlet vents and said outlet vents being in the form of peripherally arranged openings disposed in substantially the same plane as said air propelling means, an exterior annular flange on said housing forming a guard for said outlet vents, a second exterior annular flange on said housing disposed opposite to said first flange and providing therewith an annular slot having annular undercut portions, and an adjustable handle slidably mounted in said slot and interlocking with said flanges.

8. The combination as claimed in claim '7 in which said adjustable handle comprises a shoe portion disposed in said slot, a knob portion disposed exteriorly of said flanges, and a screwthreaded member secured to one of said portions and engaging the other of said portions.

9. The combination as claimed in claim 8 in which the rear end of said housing is provided with a tapped bore, and in which said screwthreaded member is secured to said knob portion whereby said knob portion may oppositely be mounted directly on the rear end of said housing.

10. A portable tool comprising a cylindrical housing having front and rear sections with abutting end portions rigidly secured together and coaoting to form an outwardly opening groove extending circumferentiall of the ho ing, and a handle having means extending intosaid groove operative to secure the handle in various ositions of adjustment circumferentially of the housing.

11. A portable tool comprising a cylindrical housing having front and rear sections with abutting end portions rigidly secured together and coacting to form an outwardly opening groove extending circumferentially of the housing, and a handle having means extending into said groove operative to secure the handle in various positions of adjustment eircumferentially of the housing, said abutting end portions of the housing further coacting to form air outlet openings for the passage of air outwardly from the housing through said groove.

12. A portable tool comprising a cylindrical housing having forward and rear sections with abutting end portions rigidly secured together and annular portions oiTset radially outward from said abutting end portions and spaced apart in a direction longitudinally in the housing to form an outwardly opening slot extending circumferentially of the housing, and a handle adjustably mounted in said slot.

GARY G. BLUEMINK. ROYAL A. BEACH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 700,642 Hanford May 20, 1902 1,539,069 Brockett May 26, 1923 1,596,013 Gebhordt Aug. 1'7, 1926 2,123,222 Albertson July 12, 1938 

